Device for constructing arches or centers for furnaces



(N0 Mode-1.) I

I A. FARLEY. DEVICE FOR GONSTRUQTING ARGHES 0R CENTERS FOR FURNACES. No,878,520. Patented Jan. 17, 1888.

mjmxssxs'. Wuhan/$08 U ITED 1 STATES PATENT OFFICE,

ALBIN FARLEY, OFVPITTSBURG, PENNSYLVANIA.

DEVICE FOR CONSTRUCTING ARCHES 0R CENTERS FOR FURNACE S.

SPECIFICATION forming part of Letters Patent N 0. 376,520, dated January17, 1888.

Application filed March 1887. Serial No. 220,870.

vfor Furnaces; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in-the art to which it pertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification.

My invention relates to a portable device for constructing arches orcenters for furnaces, the object being to provide a means whereby archesor centers over furnaces, 850., may be built on a portable frame, andalso to provide a means for adjusting the frame for the purpose ofraising or depressing the spring of the arch; and with these ends inview myinvention consists in a number of segments of circles and adevice for sustaining the same in the proper position, together withcertain details of construction and combination of parts, as will befully described hereinafter.

In the accompanying drawings, Figure l is a plan view of my device forconstructing arches constructed in accordance with my invention. Fig. 2is a side sectional elevation of the same. Fig. 3 is a perspective viewof one of the segments.

To put my invention into practice I construct a number of segmentalsections, a, forming a complete circle and of sufficient strength tosustain a heavy load placed on the top of the same. I now provide athreaded shaft, 1), having secured thereon a sleeve, 0, of suchconstruction as to properly support the smaller ends of thesegments a. Asmall crank, d, at the upper end of the threaded shaft b affords a meansfor turning the shaft and operating the sleeve. It will be seen that thesleeve 0 has a flange near its opposite ends, so as to receive betweenthem the inner ends of the segments, so that they may be positivelymoved up or down, and this sleeve should be properly threaded internallyto engage the threads of the rod.

(No model.)

In operation I provide asuitable number of standards, f, and arrangethem about the perimeter of the furnace g, on which the broad endsof thesectionsa are placed. The threaded shaft 1), I now place in the centerof the furnaceg and adjust the sleeve 0 to a suitable height,representing the spring of the arch. The sections a are now arranged orplaced in position, supported by the postsfand shaft 1),

and adjusted up or downuntil the exact spring is givento the arch aboutto be built. 7

Whenthe arch is finished, the nuts above and below the sleeve 0 arerevolved back from the same and the sustaining-postsf removed, whichoperation will allow the segments to be easily removed withoutdestroying or in any wisebreaking the same.

With this construction a-suitable frame for supporting an arch whilebeing constructed can be built in a short time and can be used anynumber of times.

I am aware that it is not new to provide a frame for constructing archesand domes, which consists of segments and a vertical shaft having afiangednut or ring thereon, the segments having their inner ends flangedto engage the upturned flange ofthe ring,and designed,when the arch hasbeen formed and the rod turned, to let the segmental sections fall intothe structure, and therefore do not claim such construction, broadly.

Having thus described my invention, what I' claim, and desire to secureby Lt tters Patent, 1s

The improved apparatus herein. described for use in the constructionofarches and domes, the same consisting of the segmental sections, thecentral vertical screw, the threaded sleeve thereon having flanges, asshown, to engage the upper and lower sides of the segments at theirinner ends, and the hand-lever on the upper end of the shaft, wherebythe said segments may be positively engaged and moved up and down toaccurately attain the desired spring, substantially as specified.

' ALBIN FARLEY.

WVitnesses:

H. H. SALLADE, M. E. HARRISON.

